These are
Judges Guild products that use the Castles &
Crusades rules. A list of products proposed in 2006 that may or may not
see print in one form or another can be found here.
* = Not Judges Guild related

Zocchi
Distributors reprinted a handful of Judges Guild Scenarios. These
reprints are nothing but photocopies of the original books, and are
practically worthless to a collector, but a good buy when you merely
want to use these for playing.From Louis Zocchi: "I paid Bob Bledsaw $350
on 5 separate occasions to bail him out of cash flow binds. In exchange, I told
him that I wanted the right to reprint 5 of his out of print works. He agreed.
I dont remember how many copies of the few I xeroxed, but it was less than 25,
and more like 10."
"The only Judges Guild adventure I reprinted was TEGEL MANOR. We revised and
expanded it to make it more useful and added several features, but left the
floor plan the same. We used black ink on white paper for the maps, to make
them easier to read. I felt that the light tan simulated partchment maps with
dark brown ink, were too hard to read. I have no recollection of ever xeroxing
TEGEL MANOR. If you found one, someone else did it. I can't remember which of
the Judges Guild items we xeroxed, but it was 4 or less because of my
understanding with Bob. Frankly, I don't think we xeroxed any of the titles you
listed (these were Escape from Astigar's Lair, Inferno, Of Skulls and
Scrapfaggot Green, Tegel Manor) because I did not consider them to be as good as
Island book, 50 star bases, Castles book, and TEGEL MANOR."
"I thought we added one line of copy to the xeroxed items, saying, reprinted by
Gamescience with permission of Judges Guild. It has been too long ago to
remember for sure."

Group One was founded in late 1980 by a number of
folks who left Judges Guild, including Bob Bledsaw's sister Debbie and her
husband Marc Summerlot, plus Mark Holmer and some others. It was a
friendly split, and Bob even helped them out with advice, equipment, and such
(Judges Guild was doing well at the time and their products were selling like
hotcakes, far more demand than supply at the time). Most of the folks that
left for Group One returned to Judges Guild afterward, in late 1981 or early
1982.

These are
entirely different from the Judges Guild's City State of the Invincible
Overlord, they only used the name. Mayfair released all of the later supplements
in small boxes. They had plans for a series of over two dozen adventures
and sourcebooks.